PHP trim()函数详解

定义

trim – 去除字符串里的空白符及其他指定字符

strip whitespace (or other characters) from the beginning and end of a string

描述

trim ( string $str [, string $character_mask = " \t\n\r
trim ( string $str [, string $character_mask = " \t\n\r\0\x0b" ] ) : string
\x0b" ] ) : string

参数 character_mask 可指定任意字符，使用..可指定一个范围
默认去除下面五个字符

• ” ” (ascii 32 (0x20)), an ordinary space – 普通空白符.
• “\t” (ascii 9 (0x09)), a tab – 制表符.
• “\n” (ascii 10 (0x0a)), a new line (line feed) – 换行符.
• “\r” (ascii 13 (0x0d)), a carriage return – 回车符.
• “\0” (ascii 0 (0x00)), the nul-byte.
• “\x0b” (ascii 11 (0x0b)), a vertical tab – 垂直制表符.

示例

trim($text, " \t.");
trim($hello, "hdle");
// (from 0 to 31 inclusive)
trim($binary, "\x00..\x1f");

参看

类似函数，ltrim(),rtrim()